package com.jt.controller;

import com.jt.pojo.Item;
import com.jt.pojo.User;
import com.jt.service.UserService;
import com.jt.vo.ItemVO;
import com.jt.vo.SysResult;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

@RestController
@CrossOrigin
@RequestMapping("/poiuser")
public class POIController {
    private final static String DATE_FORMAT = "yyyy/MM/dd";
    @Autowired
    private UserService userService;

    @GetMapping(" ")
    public SysResult outputExcle() throws IOException {
       List<User> list =  userService.findAll();
        //在内存中创建一个Excel文件
        XSSFWorkbook workbook = new XSSFWorkbook();
        //创建工作表，指定工作表名称
        XSSFSheet sheet = workbook.createSheet("用户");

        //创建行，0表示第一行
        XSSFRow row = sheet.createRow(0);
        //创建单元格，0表示第一个单元格
        row.createCell(0).setCellValue("序号");
        row.createCell(1).setCellValue("用户名");
        row.createCell(2).setCellValue("电话");
        row.createCell(3).setCellValue("邮箱");
        row.createCell(4).setCellValue("状态");
        for (int i = 0; i < list.size(); i++) {
            XSSFRow row2 = sheet.createRow(i+1);
            User user = list.get(i);
            row2.createCell(0).setCellValue(user.getId());
            row2.createCell(1).setCellValue(user.getUsername());
            row2.createCell(2).setCellValue(user.getPhone());
            row2.createCell(3).setCellValue(user.getEmail());
            row2.createCell(4).setCellValue(user.getStatus());

        }

        Date a = new Date();
        String filename = a.getYear()+"年"+a.getMonth()+"月"+a.getDay()+"日"+a.getHours()+a.getSeconds()+a.getSeconds();

        //通过输出流将workbook对象下载到磁盘
        FileOutputStream out = new FileOutputStream("D:\\"+filename+".xlsx");
        workbook.write(out);
        out.flush();//刷新
        out.close();//关闭
        workbook.close();
        return SysResult.success();
    }
/*    @PostMapping("/upexcel")
    public SysResult excleUp(@RequestParam("file")MultipartFile file,HttpServletRequest request) throws IOException {
        System.out.println(file);
        //检查文件
        checkFile(file);
        //获得Workbook工作薄对象
        Workbook workbook = getWorkBook(file);
        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
        List<User> list = new ArrayList<User>();
        if(workbook != null){
            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
                //获得当前sheet工作表
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if(sheet == null){
                    continue;
                }
                //获得当前sheet的开始行
                int firstRowNum  = sheet.getFirstRowNum();
                //获得当前sheet的结束行
                int lastRowNum = sheet.getLastRowNum();
                //循环除了第一行的所有行
                for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
                    //获得当前行
                    Row row = sheet.getRow(rowNum);
                    if(row == null){
                        continue;
                    }
                    //获得当前行的开始列
                    int firstCellNum = row.getFirstCellNum();
                    //获得当前行的列数
                    int lastCellNum = row.getPhysicalNumberOfCells();
                    String[] cells = new String[row.getPhysicalNumberOfCells()];
                    //循环当前行
                    User user = new User();
                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
                        Cell cell = row.getCell(cellNum);

                        if(cellNum==1){
                            user.setUsername(cell.getStringCellValue());
                        }
                        user.setPassword("111111");
                        if(cellNum==2){
                            user.setPhone(cell.getStringCellValue());
                        }
                        if(cellNum==3){
                            user.setEmail(cell.getStringCellValue());
                        }
                        if(cellNum==4){
                            user.setStatus(cell.getBooleanCellValue());
                        }


                    }
                    list.add(user);
                    userService.saveUser(user);
                    System.out.println(user);
                }
            }
            workbook.close();
        }
        return SysResult.success();

    }*/
    @PostMapping("/uploadExcel")
    public SysResult uploadExcel(@RequestParam("file") MultipartFile file,
                                HttpServletRequest request) throws IOException {

        //检查文件
        checkFile(file);
        //获得Workbook工作薄对象
        Workbook workbook = getWorkBook(file);
        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
        List<User> list = new ArrayList<User>();
        if(workbook != null){
            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
                //获得当前sheet工作表
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if(sheet == null){
                    continue;
                }
                //获得当前sheet的开始行
                int firstRowNum  = sheet.getFirstRowNum();
                //获得当前sheet的结束行
                int lastRowNum = sheet.getLastRowNum();
                //循环除了第一行的所有行
                for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
                    //获得当前行
                    Row row = sheet.getRow(rowNum);
                    if(row == null){
                        continue;
                    }
                    //获得当前行的开始列
                    int firstCellNum = row.getFirstCellNum();
                    //获得当前行的列数
                    int lastCellNum = row.getPhysicalNumberOfCells();
                   User thisUser = new User();
                    //循环当前行
                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
                        Cell cell = row.getCell(cellNum);

                        if(cellNum==1){
                            thisUser.setUsername(cell.getStringCellValue());

                        }
                        if(cellNum==2){
                            thisUser.setPhone(cell.getStringCellValue());

                        }
                        if(cellNum==3){
                            thisUser.setEmail(cell.getStringCellValue());

                        }
                        if(cellNum==4){
                            thisUser.setStatus(cell.getBooleanCellValue());

                        }
                    }
                    list.add(thisUser);
                    System.out.println(thisUser);
                }
            }
            workbook.close();
        }

        System.out.println(file);

        return SysResult.success();
    }
    //校验文件是否合法
    public static void checkFile(MultipartFile file) throws IOException{
        //判断文件是否存在
        if(null == file){
            throw new FileNotFoundException("文件不存在！");
        }
        //获得文件名
        String fileName = file.getOriginalFilename();
        //判断文件是否是excel文件
        if(!fileName.endsWith("xls") && !fileName.endsWith("xlsx")){
            throw new IOException(fileName + "不是excel文件");
        }
    }
    public static Workbook getWorkBook(MultipartFile file) {
        //获得文件名
        String fileName = file.getOriginalFilename();
        //创建Workbook工作薄对象，表示整个excel
        Workbook workbook = null;
        try {
            //获取excel文件的io流
            InputStream is = file.getInputStream();
            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
            if(fileName.endsWith("xls")){
                //2003
                workbook = new HSSFWorkbook(is);
            }else if(fileName.endsWith("xlsx")){
                //2007
                workbook = new XSSFWorkbook(is);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return workbook;
    }
    public static String getCellValue(Cell cell){
        String cellValue = "";
        if(cell == null){
            return cellValue;
        }
        //如果当前单元格内容为日期类型，需要特殊处理
        String dataFormatString = cell.getCellStyle().getDataFormatString();
        if(dataFormatString.equals("m/d/yy")){
            cellValue = new SimpleDateFormat(DATE_FORMAT).format(cell.getDateCellValue());
            return cellValue;
        }
        //把数字当成String来读，避免出现1读成1.0的情况
        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }
        //判断数据的类型
        switch (cell.getCellType()){
            case Cell.CELL_TYPE_NUMERIC: //数字
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式
                cellValue = String.valueOf(cell.getCellFormula());
                break;
            case Cell.CELL_TYPE_BLANK: //空值
                cellValue = "";
                break;
            case Cell.CELL_TYPE_ERROR: //故障
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知类型";
                break;
        }
        return cellValue;
    }
}


